Methicillin-Resistant *Staphylococcus aureus* (MRSA) Detection by Probe (Qualitative) in Whole Blood
This test checks for the presence of *Methicillin-resistant Staphylococcus aureus* (MRSA), a type of bacteria that can cause serious infections. MRSA is resistant to certain antibiotics, including methicillin.
["MRSA is a bacterial infection that requires careful monitoring and treatment with antibiotics that target it specifically."]
Key facts at a glance
- LOINC
- 85786-2
- Short code
- mecA Bld Pos Ql NAA+n-prb
- Synonyms
- mecA Bld Pos Ql NAA+n-prb
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- non-probe-amp-tar
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may recommend this test if you have symptoms of infection—such as fever, redness, or pain—and have been exposed to MRSA. It’s also used in certain hospital or healthcare settings to prevent the spread of MRSA among patients and staff.
What Does a Positive Result Mean?
A positive result means MRSA bacteria were detected in your blood. This indicates an active infection that requires immediate medical attention and treatment with appropriate antibiotics. Your doctor will guide you on the next steps, which may include starting antibiotic therapy.
What Does a Negative Result Mean?
A negative result means MRSA was not detected in your blood sample at the time of testing. However, MRSA can still be present in other parts of your body or in your environment. If you have symptoms of infection, further testing or follow-up may be needed.
How Is This Test Performed?
A small sample of your blood is collected via a needle inserted into a vein, usually in your arm. The sample is then tested in a lab using a specialized probe to detect MRSA DNA or specific markers associated with the bacteria.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
MRSA Blood Screen (Qualitative)
Frequently asked questions
What are the possible side effects or risks of this test?
How soon will I get my results?
Can I take anything by mouth before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy